Delete unused AudioBusRefCounted structure.

media/base/audio_bus.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BASE_AUDIO_BUS_H_
 #define MEDIA_BASE_AUDIO_BUS_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/aligned_memory.h"
-#include "base/memory/ref_counted.h"
 #include "media/base/media_export.h"
 
 namespace media {
 class AudioParameters;
 
 // Represents a sequence of audio frames containing frames() audio samples for
 // each of channels() channels. The data is stored as a set of contiguous
 // float arrays with one array per channel. The memory for the arrays is either
 // allocated and owned by the AudioBus or it is provided to one of the factory
 // methods. AudioBus guarantees that it allocates memory such that float array
@@ skipping 273 matching lines @@
     for (int source_frame_index = read_offset_in_frames, write_pos_in_dest = ch;
          source_frame_index < read_offset_in_frames + num_frames_to_read;
          ++source_frame_index, write_pos_in_dest += channels) {
       float sourceSampleValue = channel_data[source_frame_index];
       dest_buffer[write_pos_in_dest] =
           TargetSampleTypeTraits::FromFloat(sourceSampleValue);
     }
   }
 }
 
-// RefCounted version of AudioBus. This is not meant for general use. Only use
-// this when your lifetime requirements make it impossible to use an
-// AudioBus scoped_ptr.
-class MEDIA_EXPORT AudioBusRefCounted
-    : public media::AudioBus,
-      public base::RefCountedThreadSafe<AudioBusRefCounted> {
- public:
-  static scoped_refptr<AudioBusRefCounted> Create(int channels, int frames);
-
- private:
-  friend class base::RefCountedThreadSafe<AudioBusRefCounted>;
-
-  AudioBusRefCounted(int channels, int frames);
-  ~AudioBusRefCounted() override;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioBusRefCounted);
-};
-
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_BUS_H_